Insulin Research Articles

Assessment of IL-6, MDA, GSH and Serum Electrolytes in Diabetic Patients

Background: The public health community has been paying a lot of attention to metabolic syndrome, sometimes known as diabetes mellitus (DM). In many cases for the patients with type 2 diabetes mellitus characterized by an uncontrolled rise in blood sugar (hyperglycemia) brought on by an inability of the body's cells (such as muscles) to detect and utilize the circulating insulin, a condition known as insulin sensitivity or insulin resistance, or by an insulin deficiency. (caused by pancreatic beta cell damage or decreased insulin release). These cases are accompanied by systematic inflammation in the long term, and as a result of the immune effect, there will be an increase in the levels of lipids peroxidation and thus a decrease in the levels of antioxidants. Objective: The study includes an evaluation of inflammatory levels and oxidative stress through an assay of IL-6, malondialdehyde, glutathione, and serum electrolyte levels in the patients with uncontrolled type 2 diabetes mellitus compared with the control. Methods: The case-control study, where ablood sample collections from patients with uncontrolled type 2 diabetes mellitus and control apparently healthy. The samples were analyzed by ELISA, spectrophotometers, and electro-analyzer apparatus. Results: It was found that patients with uncontrolled type 2 diabetes have lower-grade inflammation, which is the reason for the significant increase in interleukin-6 (215±13 Pg/mL) compared with healthy (50±10 Pg/mL). Also, the high levels of free radicals and peroxides can be expressed by the increase in malondialdehyde, as well as a significant reduction in the levels of glutathione value. Patients with uncontrolled type 2 diabetes suffer from electrolyte disturbances due to excessive urine caused by high osmolality and metabolic acidosis due to high ketone bodies and consequently high potassium levels (hyperkalemia) (6.7±0.59 mmol/L). Conclusion: Uncontrolled high diabetes in type 2 patients leads to high inflammatory levels in the body, and this is the reason for increase interleukin 6 levels. Inflammations caused by the immune effect resulting from diabetes lead to the synthesis of higher levels of free radicals, leading to the oxidation of lipids and a decrease of glutathione concentration.

The New Emerging of Diabetes Treatment: A Review of Oral Insulin

The New Emerging of Diabetes Treatment: A Review of Oral Insulin

A pH-Responsive Psyllium-Hyaluronic acid and Collagen based Hydrogel for Oral Insulin Delivery

Diabetes mellitus is a chronic and heritable condition which grows adverse with date and eventually accelerates numerous difficulties such as end-stage renal disease, cardiac infections and vision problems. Objective: To highlight protein-based hydrogels as a contemporary focus in insulin delivery through the oral cavity. Methods: Novel hydrogels were formed in this study by using biomaterials (Psyllium, Hyaluronic acid and Collagen). The hydrogels were synthesized through a methodical process involving the combination of psyllium ispaghol husk, hyaluronic acid, and collagen for targeted insulin delivery. Initially, 1g of psyllium ispaghol husk was uniformly mixed with 200ml of distilled water. After achieving a homogeneous swelling, hyaluronic acid and collagen were added to the mixture. The synthesis of hydrogels was achieved by allowing the mixture to incubate at 38°C O/N. Physical characterization was done using FTIR analysis which indicates different bonding patterns. Results: Swelling ratio and drugs kinetics of hydrogels reveal maximum swelling and drug release at alkaline pH while minimum at acidic pH. Swelling kinetics shows that hydrogels followed less Fickian diffusion. These points favour the delivery of insulin in the intestine while escaping the acidic medium of stomach. Zone of inhibition around the hydrogels illustrated its antimicrobial activity. Finally, its administration to mice indicates the delivery of insulin by the decrease in glucose level measured by glucometer. Conclusions: Based on the diverse analyses conducted, it can be inferred that utilizing biomaterial-based hydrogels holds significant promise for effective insulin delivery through the oral route, especially beneficial for diabetic patients.

Serum Calcium and HbA1c Levels in Sudanese Patients with Type II Diabetes mellitus: is there any correlation?

Background: By influencing the production and release of insulin from the pancreatic beta cells, calcium ions have a significant impact on glycemic control. Calculating calcium levels is crucial for tracking insulin secretion because hypocalcaemia in non-diabetic individuals is linked to impaired insulin release. The purpose of this study was to measure serum calcium levels and compares them to HbA1c levels in Sudanese patients with type II diabetes who reside in Khartoum State. Methods: At the Al-Amal Diabetes Center, 60 Sudanese patients with type II diabetes were the subjects of a cross-sectional hospital-based study conducted between March and June 2021. Demographic information, the length of diabetes, the kind of treatment, and co-morbidity were all covered by a standard questionnaire. Using the Mindray B 300 device, the HbA1c and serum Ca2+ were measured. SPSS version 25 was used to analyze the data. Results: The participants' mean age was 56.8±13 years. Of the participants, two thirds are men. The average duration of diabetes was 12.0±8.8 years. The results showed that the mean HbA1c was 8.2± 2.5 % and the mean serum Ca2+ was 8.5± 0.4 mg/dl. HbA1c and serum Ca2+ did not show any discernible correlation (r = 0.104 and P = 0.429). Serum Ca2+ levels did not significantly correlate with the participants' ages or the length of time they had diabetes mellitus. Conclusion: The results of this study showed that neither the duration of the DM nor the HbA1c were significantly correlated with the serum Ca2+ level. These results need to be confirmed by a more extensive investigation.

Genetic background of type 1 diabetes mellitus: A review

Type 1 diabetes mellitus (T1DM) is an autoimmune disease characterized by the complete lack of insulin secretion due to the immune system’s destruction of insulin-producing pancreatic β-cells. Approximately 50% of the risk factors for T1DM are attributed to genetic susceptibility, with the remaining causes linked to epigenetic modifications and environmental factors. The major gene region involved in T1DM is the major histocompatibility (MHC) complex, which is the first region discovered, conferring 50% of the genetic risk, followed by the insulin (INS), cytotoxic T lymphocyte-associated protein (CTLA4), protein tyrosine phosphatase, non-receptor type 22 (PTPN22), interleukin 2 receptor alpha (IL2RA) and interferon-induced with helicase C domain (IFIH1) genes. The remaining genetic susceptibility has been uncovered through genome-wide association (GWA) studies, which have identified 120 single nucleotide polymorphisms (SNPs) associated with T1DM risk to date. Additionally, non-coding RNAs (ncRNAs) also play a role, affecting the expression of the genes involved in T1DM. Epigenetics bridges the gap between genetic predisposition and environmental factors, which act as a trigger for T1DM in susceptible individuals. In this paper, the major genes involved in the risk of T1DM are reviewed.

Comparative assessment of physicochemical properties of plant active molecules having antidiabetic potential

Diabetes mellitus is one of the most prevalent diseases found in all parts of the world. It is a complex heterogeneous group of metabolic disorders including hyperglycemia and is associated with imbalances in carbohydrate, protein, and lipid metabolism. The management of diabetes mellitus is considered a global problem. In current allopathic therapy, oral hypoglycaemic agents and insulin are used to control diabetic conditions. Traditional herbal drugs with multiple phytoconstituents and properties have been used as medicines for the treatment of a wide range of diabetes. Herbal medicines have been intrinsically safe, due to their natural occurrence, efficacy, and fewer side effects. The active molecules present in different phytoconstituents of herbal medicines act by different mechanisms to reduce the amount of glucose level in the blood. The functional efficiency of these active molecules largely depends on their physicochemical properties. In the present study, the physicochemical properties of important plant active molecules are analyzed and assessed which have antidiabetic potential and are particularly involved in regeneration of pancreatic β-cells.

Sativoside Mitigates High-Fat Diet-Induced Inflammation and Type-2 Diabetes in Adipose Tissue of Wistar Rats

This study aimed to investigate the impact of Stevioside, on the biochemical changes in high-fat diet-fed Wistar rats. Adult male Wistar rats were induced into a diabetic state through the administration of a high-fat diet and sucrose for 60 days, followed by oral administration of stevioside (20 mg/kg/day) for 45 days. Various parameters, including fasting blood glucose, oral glucose tolerance, insulin, insulin tolerance, liver function (ALT, AST, ALP), kidney function (urea and creatinine), and lipid profiles (TC, TG, FFA, HDL-c and LDL-c), serum adipokines levels such as adiponectin, leptin, resistin were assessed. Stevioside treatment notably improved glucose and insulin tolerances in diabetic rats and normalized their elevated levels of fasting blood glucose, serum insulin, and lipid profile. In the high-fat diet-induced type 2 diabetes rat model, Stevioside effectively restored the altered blood serum levels, demonstrating efficacy comparable to that of metformin. Therefore, Stevioside displays promise as a potential phytomedicine for managing type 2 diabetes mellitus. Keywords: High-fat diet, Insulin tolerance, Type-2 diabetes, Stevia rebaudiana.

Advanced Imaging Techniques for the Characterization of Subcellular Organelle Structure in Pancreatic Islet β Cells.

Type 2 diabetes (T2D) affects more than 32.3 million individuals in the United States, creating an economic burden of nearly $966 billion in 2021. T2D results from a combination of insulin resistance and inadequate insulin secretion from the pancreatic β cell. However, genetic and physiologic data indicate that defects in β cell function are the chief determinant of whether an individual with insulin resistance will progress to a diagnosis of T2D. The subcellular organelles of the insulin secretory pathway, including the endoplasmic reticulum, Golgi apparatus, and secretory granules, play a critical role in maintaining the heavy biosynthetic burden of insulin production, processing, and secretion. In addition, the mitochondria enable the process of insulin release by integrating the metabolism of nutrients into energy output. Advanced imaging techniques are needed to determine how changes in the structure and composition of these organelles contribute to the loss of insulin secretory capacity in the β cell during T2D. Several microscopy techniques, including electron microscopy, fluorescence microscopy, and soft X-ray tomography, have been utilized to investigate the structure-function relationship within the β cell. In this overview article, we will detail the methodology, strengths, and weaknesses of each approach. © 2024 American Physiological Society. Compr Physiol 14:5243-5267, 2024.

Formulation and Evaluation of Insulin-Loaded Sodium-Alginate Microparticles for Oral Administration.

The development of oral insulin drug delivery systems is still an ongoing challenge for pharmaceutical technology researchers, as the formulation process has to overcome a number of obstacles due to the adverse characteristics of peptides. The aim of this study was to formulate different sodium-alginate microparticles as a possible method for oral insulin administration. In our previous studies, the method has been successfully optimized using a small model peptide. The incorporation of insulin into alginate carriers containing nonionic surfactants has not been described yet. In order to enhance the absorption of insulin through biological barriers, Labrasol ALF and Labrafil M 2125 CS were selected as permeation-enhancing excipients. They were applied at a concentration of 0.10% (v/v%), along with various combinations of the two, to increase oral bioavailability. Encapsulation efficiency showed sufficient drug incorporation, as it resulted in over 80% in each composition. In vitro dissolution and enzymatic stability test results proved that, as a pH-responsive polymer, alginate bead swelling and drug release occur at higher pH, thus protecting insulin against the harsh environment of the gastrointestinal tract. The remaining insulin content was 66% due to SIF degradation after 120 min. Permeability experiments revealed the impact of permeation enhancers and natural polymers on drug absorption, as they enhanced drug transport significantly through Caco-2 cells in the case of alginate microparticle formulations, as opposed to the control insulin solution. These results suggest that these formulations are able to improve the oral bioavailability of insulin.

Identification of Potential Plant-Derived Pancreatic Beta-Cell-Directed Agents Using New Custom-Designed Screening Method: Gymnema sylvestre as an Example.

Folk medicines are attractive therapeutic agents for treating type 2 diabetes mellitus (T2DM). Most plant extracts that have been suggested to restore β-cells function were tested in vivo. Some only have been tested in vitro to determine whether they have a direct effect on β-cells islets of Langerhans. Currently, there are no defined criteria for screening of β-cell-directed plant-based remedies as potential antidiabetic agents. In this review, we have identified certain criteria/characteristics that can be used to generate a "screening portfolio" to identify plant extracts as potential β-cell-directed agents for the treatment of T2DM. To validate our screening method, we studied the potential therapeutic efficacy of a Gymnema sylvestre (GS) extract using the screening criteria detailed in the review. Six criteria have been identified and validated using OSA®, a GS extract. By using this screening method, we show that OSA® fulfilled most of the criteria identified for an effective β-cell-directed antidiabetic therapy, being an effective insulin-releasing agent at nontoxic concentrations; maintaining β-cell insulin content by stimulating a concomitant increase in insulin gene transcription; maintaining β-cell mass by protecting against apoptosis; and being effective at maintaining normoglycemia in vivo in a mouse model and a human cohort with T2DM. The present review has highlighted the importance of having a screening portfolio for plant extracts that have potential antidiabetic effects in the treatment of T2DM. We propose that this screening method should be adopted for future studies to identify new β-cell-directed antidiabetic plant derived agents.

Prevalence and determinants of poor glycaemic control in individuals aged between 18-60 years, at a regional hospital in KwaZulu-Natal Province, South Africa- a cross sectional study.

Achieving optimal blood glucose control is imperative for preventing diabetes related complications and negative socio-economic consequences associated with them. The aim of the study was to determine the prevalence and determinants of poor glycaemic control amongst type II diabetic outpatients presenting at a regional semi-rural hospital in eThekwini district, Kwa-Zulu Natal. An observational, analytic cross-sectional study was conducted amongst 384 systematically sampled type 2 diabetes patients. Data were collected by an interviewer administered questionnaire, clinical record review and anthropometric measurements. Bivariate and multivariate analyses were performed. Ninety one percent of the study population (349/384) had poorly controlled diabetes. Amongst uncontrolled diabetics, 80% (n=281) were older than 35 years' age group; 58% (n= 203) were male; 85% (n=295) completed primary school education and 93% (n=324) were overweight. Patients that were 35 years and older, female, employed, had a high body mass index, were on oral hypoglycaemic and/or insulin in combination, and receiving treatment longer than 3 years, had an increased odd of uncontrolled diabetes. Being female and receiving oral hypoglycaemic and/or insulin were significantly associated with poor blood glucose control. Patient that were female overweight, having a lower level of education, and greater than three-year duration of medication and on oral hypoglycaemic agent and/or insulin were more likely to have poor blood glucose control. These factors should serve as early identifiers of potential poor control and an alert clinician to adopt a more active approach to optimize treatment.

Zinc deficiency affects insulin secretion and alters insulin-regulated metabolic signaling in rats

BackgroundThe essential trace element zinc is important in stabilizing pancreatic insulin secretion. Zinc not only influences the synthesis of insulin but also affects its activity. Insulin not only exerts a hypoglycemic effect but also regulates glucose and lipid metabolisms in insulin target organs. In this study, we aimed to determine changes to pancreatic β cells and insulin secretion induced by different zinc concentrations and to evaluate the effect of zinc deficiency on glucose intolerance, insulin resistance, and insulin target organs via changing insulin levels. MethodsWe set up two experimental trials. In the first trial, male Sprague Dawley (SD) rats were divided into three groups. Group one (ZnC) received a standard diet, group two (ZnF) was given a zinc-free diet, and group three (ZnFC) was initially fed a zinc-free diet followed by a reversion to the standard diet. After sacrifice, we observed changes in blood parameters, including insulin, and examined alterations in pancreatic tissue using immunostaining, with focus on the localization of pancreatic β-cells. In the second trial, male SD rats were split into two groups, with one receiving a standard diet and the other a zinc-free diet. Oral glucose tolerance and insulin tolerance tests were then performed. After sacrifice, we evaluated changes in lipid and glucose metabolism within insulin target organs using quantitative polymerase chain reaction. ResultsIn the first trial, blood insulin levels and the area of insulin-positive staining in pancreatic β-cells decreased in the ZnF compared to the ZnC group. The ZnFC group did not show recovery in either blood insulin levels or the area of insulin-positive staining in pancreatic β-cells. In the second trial, no differences were observed in glucose tolerance or insulin resistance between the ZnC and ZnF groups. However, changes in the expression of insulin target genes were noted in the liver and adipose tissue in the ZnF group. ConclusionWe reveal that dietary zinc concentrations not only affect the concentration of insulin in the blood but also impact the localization of pancreatic β-cells involved in insulin production. Furthermore, our results suggest that changes in blood insulin levels, induced by different zinc concentrations, could cause metabolic alterations in insulin target organs such as the liver and adipose tissue. This study sheds more light on the role of zinc in insulin-regulated metabolic diseases.

Renewable Human Cell Model for Type 1 Diabetes Research: EndoC-βH5/HUVEC Coculture Spheroids.

In vitro drug screening for type 1 diabetes therapies has largely been conducted on human organ donor islets for proof of efficacy. While native islets are the ultimate target of these drugs (either in situ or for transplantation), significant benefit can be difficult to ascertain due to the highly heterogeneous nature of individual donors and the overall scarcity of human islets for research. We present an in vitro coculture model based on immortalized insulin-producing beta-cell lines with human endothelial cells in 3D spheroids that aims to recapitulate the islet morphology in an effort towards developing a standardized cell model for in vitro diabetes research. Human insulin-producing immortalized EndoC-βH5 cells are cocultured with human endothelial cells in varying ratios to evaluate 3D cell culture models for type 1 diabetes research. Insulin secretion, metabolic activity, live cell fluorescence staining, and gene expression assays were used to compare the viability and functionality of spheroids composed of 100% beta-cells, 1 : 1 beta-cell/endothelial, and 1 : 3 beta-cell/endothelial. Monoculture and βH5/HUVEC cocultures formed compact spheroids within 7 days, with average diameter ~140 μm. This pilot study indicated that stimulated insulin release from 0 to 20 mM glucose increased from ~8-fold for monoculture and 1 : 1 coculture spheroids to over 20-fold for 1 : 3 EndoC-βH5/HUVEC spheroids. Metabolic activity was also ~12% higher in the 1 : 3 EndoC-βH5/HUVEC group compared to other groups. Stimulating monoculture beta-cell spheroids with 20 mM glucose +1 μg/mL glycine-modified INGAP-P increased the insulin stimulation index ~2-fold compared to glucose alone. Considering their availability and consistent phenotype, EndoC-βH5-based spheroids present a useful 3D cell model for in vitro testing and drug screening applications.

A high-fat and fructose diet in dogs mirrors insulin resistance and β-cell dysfunction characteristic of impaired glucose tolerance in humans.

This study examined the impact of a hypercaloric high-fat high-fructose diet (HFFD) in dogs as a potential model for human impaired glucose tolerance (IGT) and type 2 diabetes mellitus (T2DM). The HFFD not only led to weight gain but also triggered metabolic alterations akin to the precursors of human T2DM, notably insulin resistance and β-cell dysfunction. Following the HFFD intervention, the dogs exhibited a 50% decrease in insulin sensitivity within the first four weeks, paralleling observations in the progression from normal to IGT in humans. Calculations of the insulinogenic index using both insulin and C-peptide measurements during oral glucose tolerance tests revealed a significant and sustained decrease in early-phase insulin release, with partial compensation in the later phase, predominantly stemming from reduced hepatic insulin clearance. In addition, the Disposition Index, representing the β-cell's capacity to compensate for diminished insulin sensitivity, fell dramatically. These results confirm that a HFFD can instigate metabolic changes in dogs akin to the early stages of progression to T2DM in humans. The study underscores the potential of using dogs subjected to a HFFD as a model organism for studying human IGT and T2DM.

FXR controls insulin content by regulating Foxa2-mediated insulin transcription

Farnesoid X receptor (FXR) is a nuclear ligand-activated receptor of bile acids that plays a role in the modulation of insulin content. However, the underlying molecular mechanisms remain unclear. Forkhead box a2 (Foxa2) is an important nuclear transcription factor in pancreatic β-cells and is involved in β-cell function. We aimed to explore the signaling mechanism downstream of FXR to regulate insulin content and underscore its association with Foxa2 and insulin gene (Ins) transcription. All experiments were conducted on FXR transgenic mice, INS-1 823/13 cells, and diabetic Goto-Kakizaki (GK) rats undergoing sham or Roux-en-Y gastric bypass (RYGB) surgery. Islets from FXR knockout mice and INS-1823/13 cells with FXR knockdown exhibited substantially lower insulin levels than that of controls. This was accompanied by decreased Foxa2 expression and Ins transcription. Conversely, FXR overexpression increased insulin content, concomitant with enhanced Foxa2 expression and Ins transcription in INS-1 823/13 cells. Moreover, FXR knockdown reduced FXR recruitment and H3K27 trimethylation in the Foxa2 promoter. Importantly, Foxa2 overexpression abrogated the adverse effects of FXR knockdown on Ins transcription and insulin content in INS-1 823/13 cells. Notably, RYGB surgery led to improved insulin content in diabetic GK rats, which was accompanied by upregulated FXR and Foxa2 expression and Ins transcription. Collectively, these data suggest that Foxa2 serves as the target gene of FXR in β-cells and mediates FXR-enhanced Ins transcription. Additionally, the upregulated FXR/Foxa2 signaling cascade could contribute to the enhanced insulin content in diabetic GK rats after RYGB.

Insulin release from isolated cat islets of Langerhans

Feline diabetes mellitus is a common endocrine disease with increasing prevalence. It shows similarities with human type 2 diabetes and is characterized by insulin resistance and deficient insulin secretion. Moreover, cats and humans belong to the very few species that form amyloid depositions in the pancreatic islets. However, little is known about cat islet function and no studies have addressed insulin secretion from isolated islets ex vivo. The aim of this study was to establish a protocol for isolation of islets of Langerhans from pancreata of cats euthanized due to disease, and to evaluate insulin secretion responses to various physiological and pharmacological stimuli. Collagenase digestion of pancreatic tissue from 13 non-diabetic cats and two cats with diabetic ketoacidosis yielded individual islets surrounded by a layer of exocrine tissue that was reduced after two days in culture. Histological examination showed islet amyloid in pancreatic biopsies from most non-diabetic and in one diabetic cat. Islets from non-diabetic cats cultured at 5.5 mM glucose responded with increased insulin secretion to 16.7 mM glucose, 30 mM K+ and 20 µM of the sulfonylurea glipizide (2-3 times basal secretion at 3 mM glucose). The glucagon-like peptide-1 receptor agonist exendin-4 (100 nM) had no effect under basal conditions but potentiated glucose-triggered insulin release. Only one of nine islet batches from diabetic cats released detectable amounts of insulin, which was enhanced by exendin-4. Culture of islets from non-diabetic cats at 25 mM glucose impaired secretion both in response to glucose and K+ depolarization. In conclusion, we describe a procedure for isolation of islets from cat pancreas biopsies and demonstrate that isolated cat islets secrete insulin in response to glucose and antidiabetic drugs. The study provides a basis for future ex vivo studies of islet function relevant to the understanding of the pathophysiology and treatment of feline diabetes.

Sleep Characteristics are Associated with Risk of Treated Diabetes Among Postmenopausal Women

ObjectiveThe purpose of this study was to determine whether sleep characteristics are associated with incidence of treated diabetes in postmenopausal individuals. MethodsPostmenopausal participants ages 50-79 years reported sleep duration, sleep-disordered breathing, or insomnia at baseline and again in a subsample 3 years later. The primary outcome was self-reported new diagnosis of diabetes treated with oral drugs or insulin at any time after baseline. Multivariable Cox proportional hazards models were used. ResultsIn 135,964 participants followed for 18.1 (± 6.3) years, there was a nonlinear association between sleep duration and risk of treated diabetes. Participants sleeping ≤5 hours at baseline had a 21% increased risk of diabetes compared with those sleeping 7 hours (adjusted hazard ratio [aHR] 1.21; 95% confidence interval [CI], 1.00-1.47). Those who slept for ≥9 hours had a nonsignificant 6% increased risk of diabetes compared with those sleeping 7 hours (aHR 1.06; 95% CI, 0.97-1.16). Participants whose sleep duration had decreased at 3 years had a 9% (aHR 1.09; 95% CI, 1.02-1.16) higher risk of diabetes than participants with unchanged sleep duration. Participants who reported increased sleep duration at 3 years had a risk of diabetes (HR 1.01; 95% CI, 0.95-1.08) similar to those with no sleep duration change. Participants at high risk of sleep-disordered breathing at baseline had a 31% higher risk of diabetes than those without (aHR 1.31; 95% CI, 1.26-1.37). No association was found between self-reported insomnia score and diabetes risk. ConclusionsSleep-disordered breathing and short or long sleep duration were associated with higher diabetes risk in a postmenopausal population.

Exploiting Apical Sodium-Dependent Bile Acid Transporter (ASBT)-Mediated Endocytosis with Multi-Functional Deoxycholic Acid Grafted Alginate Amide Nanoparticles as an Oral Insulin Delivery System.

Oral administration of insulin is a potential candidate for managing diabetes. However, it is obstructed by the gastrointestinal tract barriers resulting in negligible oral bioavailability. This investigation presents a novel nanocarrier platform designed to address these challenges. In this regard, the process involved amination of sodium alginate by ethylene diamine, followed by its conjugation with deoxycholic acid. The resulting DCA@Alg@INS nanocarrier revealed a significantly high insulin loading content of 63.6 ± 1.03% and encapsulation efficiency of 87.6 ± 3.84%, with a particle size of 206 nm and zeta potentials of -3 mV. In vitro studies showed sustained and pH-dependent release profiles of insulin from nanoparticles. In vitro cellular studies, confocal laser scanning microscopy and flow cytometry analysis confirmed the successful attachment and internalization of DCA@Alg@INS nanoparticles in Caco-2 cells. Furthermore, the DCA@Alg@INS demonstrated a superior capacity for cellular uptake and permeability coefficient relative to the insulin solution, exhibiting sixfold and 4.94-fold enhancement, respectively. According to the uptake mechanism studies, the results indicated that DCA@Alg@INS was mostly transported through an energy-dependent active pathway since the uptake of DCA@Alg@INS by cells was significantly reduced in the presence of NaN3 by ~ 92% and at a low temperature of 4°C by ~ 94%. Given the significance of administering insulin through oral route, deoxycholic acid-modified alginate nanoparticles present a viable option to surmount various obstacles presented by the gastrointestinal.

Preventing Angiotensin Converting Enzyme (ACE)-2 Glycosylation and Protease Activity Disruption as A Means of Safeguarding Against SARS-CoV-2 Infection

Gastric inhibitory polypeptide (GIP), also known as glucose-dependent insulinotropic polypeptide, is a peptide hormone produced by cells in the small intestine, especially in the duodenum and jejunum. GIP has been a major focus of scientific research due to its important role in regulating the body's response to food intake and controlling blood glucose levels after meals. GIP plays a role in stimulating the release of insulin from beta cells in the pancreas, especially after intake of foods containing glucose or fat. This insulin response is important for optimizing glucose use by body cells and maintaining blood glucose balance, preventing uncontrolled blood glucose spikes.

Loading and release of insulin from chitosan oligosaccharide biopolymeric patch for oromucosal delivery

Loading and release of insulin from chitosan oligosaccharide biopolymeric patch for oromucosal delivery